Burden of Fungal Infections in Algeria
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Eur J Clin Microbiol Infect Dis DOI 10.1007/s10096-017-2917-8 ORIGINAL ARTICLE Burden of fungal infections in Algeria M. Chekiri-Talbi1 & D. W. Denning2 Received: 21 December 2016 /Accepted: 21 December 2016 # Springer-Verlag Berlin Heidelberg 2017 Abstract We report for the first time in Algeria and provide Introduction burden estimates. We searched for existing data and estimated the incidence and prevalence of fungal diseases based on the Algeria is Africa’s biggest country by land area, and is population at risk and available epidemiological data. the world’s 10th largest. The health system in Algeria is Demographic data were derived from the National Office of designed to take care of the health needs of the popula- Statistics (Office National des Statistiques: ONS), World tion for all problems with free access to care. It is deliv- Health Organization (WHO), The Joint Nations Programme ered by the State, at national and regional levels [1].The on HIV/AIDS (UNAIDS) and national published reports. life expectancy in men is 72 years and in women When no data existed, risk populations were used to estimate 75 years. Twenty-eight percent of Algeria’s population frequencies of fungal infections, using previously described is under 16 years old [2] and health policy focuses on methodology. Algeria has 40.4 million inhabitants, and prob- preventative health care, including immunization [3]. ably at least 568,900 (1.41%) of Algerians have a serious There are issues around sanitation and clean water for fungal infection each year. Recurrent vulvovaginal candidiasis all, and communicable and waterborne diseases are rela- (485,000) and fungal asthma (72,000) are probably the tively common. commonest problems, as there are over 1 million adult asth- There has been very little focus on fungal diseases, matics. Candidaemia is estimated in 2,020 people, invasive with the notable exception of cutaneous infections. aspergillosis in 2,865 people, and intra-abdominal candidiasis More recently, increased focus on hospital-acquired fun- in 303 people; these are the most common life-threatening gal disease has emerged with cases and series of problems. AIDS is uncommon, but cancer is not (45,000 Candida biofilm formation [4]aswellassomedeep new cases of cancer including 1,500 in children), nor is mycoses [5] aspergillosis [6], cryptococcosis [7], COPD (an estimated 317,762 patients, of whom 20.3% are candidemia [8], mycetoma [9] and sporotrichosis ; given admitted to hospital each year). A focus on improving the this poverty of data, we have attempted to estimate the diagnosis and epidemiological data related to fungal infection burden of fungal diseases in Algeria, using previously is necessary in Algeria. published methodology based on populations at risk and local incidence and prevalence data (Table 1). * M. Chekiri-Talbi Methods [email protected] We searched for existing data, and estimated the inci- 1 Pharmacy Department, Université Saad Dahlab de Blida, dence and prevalence of fungal diseases based on the Blida 09000, Algeria population at risk and available epidemiological data. 2 The University of Manchester, National Aspergillosis Centre, Demographic data were derived from the National University Hospital of South Manchester and Manchester Academic Office of Statistics (ONS), World Health Organization Health Science Centre, Manchester, UK (WHO), The United Nations Programme on HIV/AIDS Eur J Clin Microbiol Infect Dis Table 1 Prevalence rates presented used to estimate the Number Source burden of serious fungal diseases in Algeria Population Population data [10] Population (M) 40,400,000 [10] %children 28 [10] Number of children 11,312,000 [10] Adults 29,088,000 [10] % women over 60 7 [10] Respiratory diseases Pulmonary tuberculosis annual incidence total 5,418 [11] Population over 40 years 11,312,522 [11] COPD prevalence all GOLD stages 9.20% [12] Asthma rate in adults 3.10% [13] Asthma numbers in adults 1 ,252,400 [13] HIV/AIDS patients Current total HIV/AIDS 9,103 [14] Proportion of diagnosed cases on ARVs 1,561 [14] Number of diagnosed cases not receiving ARVs 7,542 [14] Annual new AIDS cases (at risk of OIs) 1,077 [14] AIDS-related deaths in 2014 843 [14] AML patients per year 300 [15] Renal Tx per year 200 [16] (UNAIDS) and national published reports .Estimated Results and discussion HIV patient numbers were derived from the UNAIDS 2014 data. Patients with acute myeloid leukaemia were Superficial mycoses and dermatophytic infection assumed to be about 300 annually [15]. We identified 170 to 200 renal transplantation procedures annually In Algeria, onychomycosis and tinea capitis dominate the [16], and no other transplant procedures. The prevalence superficial mycoses [21]. Trichophyton rubrum is the pre- of chronic obstructive pulmonary disease (COPD) is dominant pathogen of feet and the inguinal folds [21]. 9.2% in the over-40-year-old population [12], and we Tinea capitis represents a public health problem in have assumed that 10.5% are admitted to hospital each Algeria, despite improvement of living conditions and af- year [17]. The proportion of adults and children with fects mostly children of school age [22]. Ectothrix tinea is clinical asthma is 3.1% and 4.1% respectively, and we the most observed form of tinea capitis. T.mentagrophytes have used only the adult figure for estimates (http:// is primarily responsible for inflammatory disease (kerion www.liberte-algerie.com/radar/un-million-dasthmatiques- celsi and related conditions) [23].There has been a rise in recenses-en-algerie-201363)[13].There are at least 100 Microsporum audouinii anthropophilic species, especially cases of cystic fibrosis cases in Algeria [18] but we in the north [24]. have not included these in our estimates. Pulmonary Using the published example of Constantine which has tuberculosis (TB) burden was taken from the Société a population of 950,000, and assuming that tinea capitis Algérienne de Pneumo-Phtisiologie (SAPP) [11], and only occurs in children (95%) [20, 25]thentheratewould 10% are assumed to have died. be 37.7/100,000. Nationally, this equates to 4,265 cases Amongst cutaneous infections, tinea capitis comes second annually. This is almost certainly a significant underesti- after onychomycosis in frequency in dermatology practice mate, as local surveys of school children indicate higher [19]. We found one published estimate of annual incidence; frequencies, but are not systematic and so not in the Constantine area, ∼100 new cases were seen to be di- extrapolatable. Published studies found variable preva- agnosed annually (2007–2011) [20]. In estimating the mini- lence from region to region: Algiers (24.6%) [23], mal national burden, we have assumed that all cases are seen Constantine (37.2%) [21], Tipaza (62.4%) [23, 26], and at the University Hospital for the entire region, and that this Blida (66.4%) [27]. We note that tinea capitis is more frequency is reflected nationwide. When no data existed, risk important in these last Wilayas (localities), possibly ex- populations were used to estimate frequencies of fungal infec- plained by their more rural populations. tions, using methodology described by LIFE. We have sum- Our data are similar to other countries in north Africa in- marized all recent published papers about mycoses in Algeria. cluding Tunisia and Morocco, where M.canis and Eur J Clin Microbiol Infect Dis T.violaceum are the commonest agents of tinea capitis [26, Egypt, fungi are responsible for 28–55% of cases of microbial 28]. While favus (definitive tinea capitis usually caused by keratitis [36]. Trichophyton schoenleinii) is rarely diagnosed in Algeria [29] (in the south only) [30], this pathology is still frequent in Tunisia and Morocco [26, 28]. Invasive mycoses Dermatophytes are also often isolated from ear infec- tions, with the predominant species being M.canis, Invasive aspergillosis T.rubrum, T.violaceum ,andT.mentagrophytes [31]. In Algeria, Aspergillus otitis is more often caused by In the lung, the incidence of invasive aspergillosis in the neutro- A. niger, A. flavus ,andA. terreus [30, 32]. penic patient in the north of the country is 7.7%, diagnosed by Vulvovaginal candidiasis (VVC) is common in women, antigen detection with ELISA [6]; sixteen of 208 neutropenic but there are no published data from Algeria. Candida patientswerepositive,andall16diedfromprogressiveleukemia. albicans is commonly seen microscopically in vaginal No special environmental precautions were in place. Aspergillus smears and cultured. We have attempted an estimate of flavus and Aspergillus niger were more frequent than Aspergillus the prevalence of recurrent VVC (>4 episodes annually), fumigatus in the local environment of the patient [6]. In Tunisia, based on data from five countries in Europe (including A.flavus also is more often isolated than A. fumigatus [37, 38]. France) and the USA [33]. Women over-diagnose VVC Therefore, we anticipate 47 cases of IA in haematological pa- themselves, as other problems are common mimics, nota- tients and renal transplant recipients annually. bly bacterial vaginosis. We have therefore reduced the self- COPD is relatively common in Algeria, with an estimated reported rate of recurrent VVC (rVVC) obtained by an prevalence of 1,040,000 patients [39]. Of these, 20.3% are internet survey from 9% to 6% in 15- to 50-year-old wom- admitted to hospital each year [40]. Assuming the rate of en [33, 34]. However a remarkable 485,188 women prob- invasive aspergillosis is the same as in Madrid [41]basedon ably suffer with rVVC in any given year, a population rate culture alone at 1.3%, an estimated 2,747 patients with COPD of 2,402/100,000 among females (Table 2). This fungal will develop invasive aspergillosis each year. problem dwarfs all others. There are an estimated 2,707 cases of lung cancer diag- Fungal keratitis is rarely diagnosed in Algeria, and may be nosed each year in Algeria, 7.1% of all cancers [42].